{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:LYG5V23EURS44EUNNPWGT32XUE","short_pith_number":"pith:LYG5V23E","canonical_record":{"source":{"id":"1207.1436","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-05T20:00:03Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"bd8ed5c4230dc0193b60509222a537b35e844abef4f09e72a3a20a8511201467","abstract_canon_sha256":"72b4d84f6dfb6c8d47e7c6afb1bd86406c577308fa3d92740bfcfa776178059b"},"schema_version":"1.0"},"canonical_sha256":"5e0ddaeb64a465ce128d6bec69ef57a1126191154b035daac2effe3064cf902d","source":{"kind":"arxiv","id":"1207.1436","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.1436","created_at":"2026-05-18T01:56:34Z"},{"alias_kind":"arxiv_version","alias_value":"1207.1436v1","created_at":"2026-05-18T01:56:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.1436","created_at":"2026-05-18T01:56:34Z"},{"alias_kind":"pith_short_12","alias_value":"LYG5V23EURS4","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"LYG5V23EURS44EUN","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"LYG5V23E","created_at":"2026-05-18T12:27:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:LYG5V23EURS44EUNNPWGT32XUE","target":"record","payload":{"canonical_record":{"source":{"id":"1207.1436","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-05T20:00:03Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"bd8ed5c4230dc0193b60509222a537b35e844abef4f09e72a3a20a8511201467","abstract_canon_sha256":"72b4d84f6dfb6c8d47e7c6afb1bd86406c577308fa3d92740bfcfa776178059b"},"schema_version":"1.0"},"canonical_sha256":"5e0ddaeb64a465ce128d6bec69ef57a1126191154b035daac2effe3064cf902d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:56:34.148931Z","signature_b64":"SP0ER81nCYR2mrV/un2E9SGZ1j7YsKu5/vOlKuzTQsmj/hQqnBKqTi8TgaaTBeCt63jUUq5DbllPgmV6G7DiBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5e0ddaeb64a465ce128d6bec69ef57a1126191154b035daac2effe3064cf902d","last_reissued_at":"2026-05-18T01:56:34.148256Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:56:34.148256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.1436","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:56:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y2UOnRdxLnLoj3SJ6VEMFsb7n61DmKic9Rk6hvp1Hx84tontTy5SdRtWG0jr5sI/b/G2vrgbq2F8HJf/A27VBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T20:08:35.140192Z"},"content_sha256":"0ea4983b0bc69c3a39dcb41d313133303c520f7b317430be8e5a001207f0335a","schema_version":"1.0","event_id":"sha256:0ea4983b0bc69c3a39dcb41d313133303c520f7b317430be8e5a001207f0335a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:LYG5V23EURS44EUNNPWGT32XUE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The X-ray lightcurve of Sgr A* over the past 150 years inferred from Fe-Ka line reverberation in Galactic Centre molecular clouds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"D. Porquet, P. Predehl, R. Capelli, R. S. Warwick, S. Gillessen","submitted_at":"2012-07-05T20:00:03Z","abstract_excerpt":"We examine the temporal and spectral properties of nine Fe-Ka bright molecular clouds within about 30 pc of Sgr A*, in order to understand and constrain the primary energising source of the Fe fluorescence. Significant Fe-Ka variability was detected, with a spatial and temporal pattern consistent with that reported in previous studies. The main breakthrough that sets our paper apart from earlier contributions on this topic is the direct measurement of the column density and the Fe abundance of the MCs in our sample. We used the EW measurements to infer the average Fe abundance within the cloud"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.1436","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:56:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YFjiP9nZ9EyGVS2eqVt4/g4ZbX2yWKxpngeUuh9mIcpS9t4YDgn6I5m6bYFjIOK9sV+zKnA6Jp+yPjPb8dhoAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T20:08:35.140565Z"},"content_sha256":"37cd98152e7b77e0ee26a343d8b334a1c825700dcddf582dd2e13fe1e922eb3c","schema_version":"1.0","event_id":"sha256:37cd98152e7b77e0ee26a343d8b334a1c825700dcddf582dd2e13fe1e922eb3c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LYG5V23EURS44EUNNPWGT32XUE/bundle.json","state_url":"https://pith.science/pith/LYG5V23EURS44EUNNPWGT32XUE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LYG5V23EURS44EUNNPWGT32XUE/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-10T20:08:35Z","links":{"resolver":"https://pith.science/pith/LYG5V23EURS44EUNNPWGT32XUE","bundle":"https://pith.science/pith/LYG5V23EURS44EUNNPWGT32XUE/bundle.json","state":"https://pith.science/pith/LYG5V23EURS44EUNNPWGT32XUE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LYG5V23EURS44EUNNPWGT32XUE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:LYG5V23EURS44EUNNPWGT32XUE","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"72b4d84f6dfb6c8d47e7c6afb1bd86406c577308fa3d92740bfcfa776178059b","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-05T20:00:03Z","title_canon_sha256":"bd8ed5c4230dc0193b60509222a537b35e844abef4f09e72a3a20a8511201467"},"schema_version":"1.0","source":{"id":"1207.1436","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.1436","created_at":"2026-05-18T01:56:34Z"},{"alias_kind":"arxiv_version","alias_value":"1207.1436v1","created_at":"2026-05-18T01:56:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.1436","created_at":"2026-05-18T01:56:34Z"},{"alias_kind":"pith_short_12","alias_value":"LYG5V23EURS4","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"LYG5V23EURS44EUN","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"LYG5V23E","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:37cd98152e7b77e0ee26a343d8b334a1c825700dcddf582dd2e13fe1e922eb3c","target":"graph","created_at":"2026-05-18T01:56:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We examine the temporal and spectral properties of nine Fe-Ka bright molecular clouds within about 30 pc of Sgr A*, in order to understand and constrain the primary energising source of the Fe fluorescence. Significant Fe-Ka variability was detected, with a spatial and temporal pattern consistent with that reported in previous studies. The main breakthrough that sets our paper apart from earlier contributions on this topic is the direct measurement of the column density and the Fe abundance of the MCs in our sample. We used the EW measurements to infer the average Fe abundance within the cloud","authors_text":"D. Porquet, P. Predehl, R. Capelli, R. S. Warwick, S. Gillessen","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-05T20:00:03Z","title":"The X-ray lightcurve of Sgr A* over the past 150 years inferred from Fe-Ka line reverberation in Galactic Centre molecular clouds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.1436","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:0ea4983b0bc69c3a39dcb41d313133303c520f7b317430be8e5a001207f0335a","target":"record","created_at":"2026-05-18T01:56:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"72b4d84f6dfb6c8d47e7c6afb1bd86406c577308fa3d92740bfcfa776178059b","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-05T20:00:03Z","title_canon_sha256":"bd8ed5c4230dc0193b60509222a537b35e844abef4f09e72a3a20a8511201467"},"schema_version":"1.0","source":{"id":"1207.1436","kind":"arxiv","version":1}},"canonical_sha256":"5e0ddaeb64a465ce128d6bec69ef57a1126191154b035daac2effe3064cf902d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5e0ddaeb64a465ce128d6bec69ef57a1126191154b035daac2effe3064cf902d","first_computed_at":"2026-05-18T01:56:34.148256Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:56:34.148256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SP0ER81nCYR2mrV/un2E9SGZ1j7YsKu5/vOlKuzTQsmj/hQqnBKqTi8TgaaTBeCt63jUUq5DbllPgmV6G7DiBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:56:34.148931Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.1436","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0ea4983b0bc69c3a39dcb41d313133303c520f7b317430be8e5a001207f0335a","sha256:37cd98152e7b77e0ee26a343d8b334a1c825700dcddf582dd2e13fe1e922eb3c"],"state_sha256":"df2a8347ce57e841384ba3c37738a94bb58806965dad8dcdb898653d8a94b629"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rYga4HPJtWxkUqPasNHPUjycKy+SLR99h4VkLIFa3YD+ioJitD8GSAf194SW+y/HwZe30pcm0FexYhIFn9R1DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T20:08:35.142584Z","bundle_sha256":"317c004941065cf73f1c829d3140b17c3e095323bc6db60035c09c0030a7e2d2"}}